A 7 hour walk from Shira Camp, Barranco is half way along the Machame trail, which leads to the summit of Kilimanjaro.
My suggestion
Our first night at almost 4,000m. The Barranco stage is a decisive day, as you will acclimatize and prepare for the final ascent. Drink lots of water and, as your guide will tell you, go 'pole pole' - very slowly in Swahili.
Here is why Serengeti National Park and Ngorongoro Conservation Area could be considered as the most beautiful parks in the world. A must-see during a safari in Tanzania!